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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da0fde6048c5d2a5c0f481fb5d89557d121a4c971e53eabed1e311ce43311f40' 
  AND token = 'I6yyOOuV/rffbnvwtB+34TsLwq5+rV6wyUI/AbPPu8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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