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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37dc5281753a169c9f8c175a15edce9a29afd9ec27211312a9e14e8cbdc7822' 
  AND token = '/yaaW9BeUGhm0u1HrNpXK6m0t4L7e4hDN9gObZdmP5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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