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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8372ed655b50b8cc7c0e3d5bdd1956c82e042bcc6e7d0594f3c3658c4e1396a7' 
  AND token = 'nqe2ou8wpuJGD6gF4lU0XW6TIqISCdQFWW43xt9CK+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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