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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c353d5faea15915bed18727f893130f22b56dbfeb3262b4a380c3adc07db80c7' 
  AND token = 'wGe0Hv0bfbj+s44sFi0wajqWSPoYUHNq4GEgX2jgNCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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