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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51ae066d980e5934283afce5b1a0e6b0ae328834c4c4f194c5e2854bcfd1c546' 
  AND token = 'W6KKWuTfdsKEY1vfV9Uu9Xfy5hDf0Df4MafH9ACIO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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