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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72f509a9c706a5aecdfabc1d477e443f46651c532c91e98346c3f441a39cd0e8' 
  AND token = 'VhS5rB95GQTGtPo7OmwL0oA7EcXLoEFbxzkBFWEyKeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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