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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0480dd224e9c2118d8f7def5b8e561edc061be2d18d8526b5898605c9a627a53' 
  AND token = 'cAoEV16jyHasd24h2g4han4OqKxUt7wM9Oi+TSlgvW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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