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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4a6f368abd1a8978876b1671e867e4e4683cc9e050eb379a5009b8d6c523fb6' 
  AND token = 'So/TKPf6gzzZKtjRSrUp6Ix45qFbeia5JCbf70Gbz74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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