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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bd1aac027d3336e57f9dd60a11ee9a0416df0abe629538c83dcd43b9bfa5334' 
  AND token = 'PEZNmtOYieAo9a1EtbijV+n3Kjdqx7BKX85p4v8Icns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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