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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c7c1b3ea06dd585a994c24f9e7fbee61605b9dfa47f9ad0f7e38efc92ba4312' 
  AND token = 'EVavrBtdpmzEToLxHDIDZTa4CFLDRjQSCqR9xtfuUFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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