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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54dc083b1522380a2333ca7ec8a3c7f52a0a02f4cddbdd8b18cb2c15387f733c' 
  AND token = 'fGP+i//RgCxlfeu+D+bMY9f+ftOap18n27dO87F8+co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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