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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2974e90c5a015d1c1318f45d2ee55a263bae9d1962b9ea8b5fb824bbb0eb24b7' 
  AND token = 'b4FU89jqxMWahPFYzT19nrN4ZjfqTsg1mdVEvfVAJI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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