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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cad54ed33e87b71ec728533bda0cc2401a427454efe080696c753e2dd8dd0fca' 
  AND token = 'Ewl8lWrXjgvXaGPYFzDR+WSMbFLpU8Zyl8c++0ief/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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