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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71a17669bbca9229c8b8f9ec2d0fa3abd6f73460dc699032da97ab0274e42f5a' 
  AND token = 'ADw0L2ob0KOH3j0m7Hjw6biQeDu+U7FlPVjsU7Gr2X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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