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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b11af5ac387e2ed4551b35be3ad4bb0fb861e0ed2699f407d2a01e357576df04' 
  AND token = '/7c5zUA41tOV3wyvq9Rjs155RjRtj3PK9a1qXebD3ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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