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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d908e0e1a6ffc9ada6e37d2706c7c70bbb0083c1f9eb6ad8a056873194e9e03' 
  AND token = 'ef6cgpcSVc5e9g4YFp4CeCeUS67mmInQ2lQFnyUG9Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}