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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7f81d7fa97d6b1dd04e03441a8c51ee7c45260074ea4df0d5bc1e09cd61292' 
  AND token = '92Q+CkfXzfoQLpKV3bSMte2bYYZtxzBRblijy1xeI7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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