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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383cfa2ab100872437bfa4a5d5cfccc5bbe671281ea783c0d2d2b8a95daf0f3a' 
  AND token = 'nHVNOjAfzMDALV//IfffO+1C12H1u3uRq1GB/+DgBR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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