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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67a82699a7d0b52cdf38c07dd3ac6ac18f29d0971631f7090f5c5edc704c6f88' 
  AND token = 'Sc4/mTav1fxJF+k6l88uRy7WuCcwjSX9knWSgzM21Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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