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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a9c3573823f0b3684de508aec8ba0662c6bd9637c1637f625c6392f0a2db79' 
  AND token = '8JbWZxKd/ce+xqpbZTjoHLSbu3y8Cb/VT9n7XLAkPME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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