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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cde5c992dc378435e5fc18c3bbe7b9e920ef1c761205c9de2c9e04e1c22f614' 
  AND token = 'loDe1itYVPsJ6O0QazExaTDdQlZJpbK6ma6KrMBla+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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