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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4496946f0fc50746e5a2f71504162df9f24d45ad0c2b21525983c9fcd748b5be' 
  AND token = 'aTlYuS6aU+FePVOWer/RrvcA2oyTnhRCVA8r95a2NY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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