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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79c43c434aabbe5e2145a99712afbb43131e851d891215b0502213ebdb89fc2e' 
  AND token = 'jeAj/5XuF6GJwhQbSxsE71T0rQwwT4UJTkMj2TX6Vfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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