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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0dcd137f7254dc847902db8dda3ca988009f5f6f4c9116a7f34007ecf44e4c0' 
  AND token = 'qE3h4TEC598TX1kutnjlz9aARILmTDe191mBDvpCIIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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