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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5edd7f5fa48de46ae8de42756d3159dba1bde1146a6bcebd2f6bca4800b6a41e' 
  AND token = 'w6ZMtW62lXWElJDygLQzMxA+JbUZGaCuU11CMv0yupA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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