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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e88a365a5ed8a11d3c8d3e88cc2e9af9e98608d27adf5fa14c137613bf015bbd' 
  AND token = '/gn6aRuDWgm7HxKpf7r4aGEUzoSzKU/aitDzor3Re0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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