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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cca8ca9513972d9fadf679a7d420d2b5559bb90b9c761a66a679625e25471635' 
  AND token = '9t8V4VG3nWP9feLNXkYzUHostlUpL7IALRa36t0yzjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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