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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '624771919f6c22c281bc6d71c26aa67e7bafd114e04ab97da392b4e8ef36171b' 
  AND token = '0+9aA8TK6RYfBUNgpV0IVbi5552qEW7D+lk7u2g1GxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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