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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35fe1301ba5e49f3f1ba358a6aee144e1dd05186c9f77026ea6437185e3e30ba' 
  AND token = '3QwFBAJepO5MOoOy+9ZwAYFe8r/oZBzJWURy3wDVLE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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