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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9db22fd7b7be44e727dbb351f8101f0bc51a3c42511d1f70b8b78f5d233bf2da' 
  AND token = '90UAnsUuDtfm3KPFduM7qsSS2VbmuuUe25TfvWnVypA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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