SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32a759c83c12dd225679526cca89e29ca3484f67b9576d508239c8a3afb5d1a7' 
  AND token = 'q7LuLrPKSvDO4DvFnVqAh0dKArGpBBsegibjXr5g3Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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