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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a583861b3456e2157cb2a3344c01f7e2c6dda9c27fe31a13f083b54c34c4ce33' 
  AND token = 'wSTFKvusvhZnFHWJ9F1lPkflTmQEe04XZp3j8jkBSKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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