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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca9042b88e3693c21d8b82d27b53cf883f09080cf48248b6a4081d1aa14f9a6b' 
  AND token = 'jplJGGhOXffbnOy48Jepcaz6ohyKNYFFv6jjMWqsL64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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