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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc886d38d6742caa46f01844506649964f305f2340e15ee215bb5f521b815b94' 
  AND token = '+fF3A92QycUpfHUIxTVxZSWSg1dua1OFCgH5ydN51Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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