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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd19189d2d22cf6d7e0f135d9e5993f890a9be452d8d985a68ad8eb3ac8f3551d' 
  AND token = 'hWeOrsBashUeM7KsiN0FVTYd80xToWaR9fu7+dRvOvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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