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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f79a7fac507f7e40a4d714c45fd8fbe886ce8d18d9aa03c4b9237cdbcdae606' 
  AND token = 'iLfbkyTvzCYsALa+KOKHowYasmU8QJUW2Lut2+smxJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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