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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b47ce19f2f4a413ee6170add9524ef952f3ae2edc9067e52880e9bd9dfd08921' 
  AND token = 'HNq8wcs3djQNOOC8iNT9YDvCHRkTHCvBU6/venHZVDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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