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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ace11397af03a6c36f111a413bcf786a3e32b0bf8349161d39413d6b12233175' 
  AND token = '2p3G5odU5ZgRaCLf8XoVYxJdsRkSWKMHdeiICciTx1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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