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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7934f3c2a18422756da248cbffbaeac9e6ef57e90a357dbe2ede76f7bda6bf5f' 
  AND token = 'gIieru9muoT/ny9jWFwo3yqw3fgwPbblXDPqMcWPTc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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