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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a991fc19a50740f248ea0a7d025a5e9eda682c5a76c47a3c0cb2061ffa3cecfb' 
  AND token = 'q5D7tDi6u4m6TGSedYZCCgCYyjc9ANUmsa2zMnLTdGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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