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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dbb802a5203c0b6f800e996de4494e6577b87a9767aee64f58942c7722106b0' 
  AND token = 'kN2DybkiVJBKR++QBErMTP36Ni9r9da6HJSQXm7O4z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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