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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce02cef4a016891f1579c72ce1682bd26c3367771fb04f3c2ac490436b0efc6' 
  AND token = 'LpItC+3UlWmrzLkOpL4xJl4dl0QybIr4sSq/Lf9pL1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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