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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfe2650f5de35af7758c4e2804eb99642da40fc624d5bbdbe46ff65008d38309' 
  AND token = 'yP4OnPAeOjdl4ePnASYZWerwVM4kAg7NrqVCj0nZjJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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