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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3258d3518b31c01ab5afb62f62556bb3a88493e4b31e15b7bb91865914b4d5b1' 
  AND token = 'fIQSZaxb+IcoASL35FjysYiFEU80eAa5g5lELh7ZD8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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