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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ad899c9502cac2f005dc8b1eedaec3f76362b732073384721ad9edaaa755063' 
  AND token = 'yGnplAai29Tv3JitFCUnKeH0tsv3+vnnwsvtwNOi2Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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