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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77999f195dcc94fbeb9349d2160ef2b1c8b85f019c3d5b39529bf333f64dd623' 
  AND token = 'G0jD9nSAouu5j+3qva5xH8B3ocXRjro5znIHpNWksfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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