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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57d3d5b53a52c58433a280865e4d09f69217785de0ebb6799e9b452cf8e5bfb1' 
  AND token = 'WIEXX8IwiqILpljzRANJ24xDGW18S1oWYqUCPeP5JQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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