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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '733a027fc9696fb819d7f9769116f42b3a77bcec98a2ea0768ed8ce9cd191d97' 
  AND token = 'S8MQVXj3BZSzFuPYecaE2aOGNOwfubXbOmjtLy3gNzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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