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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e25c6ddd52b64d9696e74e1acc30d3c4e6acb060993d3dd9edb0eabd97c9711b' 
  AND token = 'D4JY15kmHQ0VfdFfAjJOo4mKQvuQfSBV4qgrJfloGH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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