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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d3d314d56bbe6f198551e2ac2b621e7738f4e3c058bda02f6ee761d30d5f6c0' 
  AND token = 'hnsW0b7TrKKGx8rHUif1F06Ok0ZhJORlIj542rxqd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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