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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ea7e8d76cfcad4e350ede9c49b52084c1320c544d527bcf3dea4237cbff5c3f' 
  AND token = 'EO/fgLc3UHd9FUuEIULhI+ZbMfrkQNNg+3fMJ/vgQzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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