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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b354c69993e7fd22425b8655eeca18cd598a1afca00343c9c69956fe87101e73' 
  AND token = 'RdRvKXcZ0STNc1wnws6H5gCxFcEiudg/AXY1OuShFQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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