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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8406fac774e0264c0ed263272369f2abf909d5615276f7824fd34567d7a0ed90' 
  AND token = 'HYvDeORLS8rUmLoBDtbV7HDP3w3xuIFsodBllF8TULE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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