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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3edcc3e688a9261c77e4dcda03f7fc647c4bce7d9dee8d6ca4cfa84282bb5045' 
  AND token = 'xZtFbjtSKn4MKcAPreWErO5kmJDh0yZkv12FPPtdS74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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