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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '913bdbc7248a424f64effa6d111cf61296ec8c5b1b3cdfad7e9e66670b3cd438' 
  AND token = 'kqwVMp3NApFbt6FonTZw19q32HKeiyeXjpEQj81A0l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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