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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '885f2d8e423f61750087b3f16e25f30be5b3dd6dde625048167468534a8f724c' 
  AND token = '0rgUYM47DeNXUnecPMBP2ENfg62pq2NdOVH7AdTcx2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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