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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa6827ee81af1b7ce06be6bfac8caf069e0668f9bb941beee5426711fa1480c7' 
  AND token = '/Iozbgt6i99JiMBlsjwqIZ+4xkA+nnR8st0IOq8WrpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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