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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e6b73951190a38fb5204a041ccaa7418ef1b85d900814273932866e3813457' 
  AND token = '9UcIwq4g18JS5yp95GgfJ1DJOiy99t9jc/OQ7K2kTgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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