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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '789922880a4e4f2131fe13b4667bf33e21694b7a81499f89241fdd26fdd111fc' 
  AND token = '1C1uJnXIm9DwbGiN08RnH0AeXx9/OUkPzrak7eKIN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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