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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99b93edbcef05f5de4fcd9156c277fe69c146ecfc5e74f46a43cd5f3a5dc07d2' 
  AND token = 'e6sh2mPVPOvxOpi6feQqJta1BOQe3omdngLUCA5eIAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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