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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b282718f788f94149ef8785700d118bdb9f5ee6bfbf0356b8cf829cb20d0c6' 
  AND token = 'km5bDWlsrdFo1j/uNCRktk0zMorMObCaQyb3DArO/NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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